Problem: (Referencing Assembla ticket 3768)
User is getting error message "Internal Server Error".
Please note, there could be other reasons for this error than what is listed here. If you discover additional reasons that cause this error, please update this article accordingly.
It was discovered that the session Host added their email ID to the session invitation list. Removing their email ID is going to remove the session, so create a entirely new session and do not add the Host email ID to the Session Invitation List. DO NOT CLONE this session or you will get the same error.